I think it could be confusing for some people when rewards for one product are placed on packaging for another product.
The first (logical) impression is that the rewards are for the product that is actually in the box. Not everyone would read small "DW1640" letters under the reward and deduce that the reward is for something else, and not for what's inside. Many retail buyers wouldn't really know or care about the model number.
Something similar is done for software reawards on software makers' websites, but at least the average person visiting such site would be more educated/knowlegable about software version numbers.
Other than that, I am really happy CDRLabs is featured on the Benq retail box !